kurihara has found what he's looking for. today is a big day for the dealers at the tsukiji market in toyko. it's japan's biggest wholesale market for fish and seafood, including blue-fin tuna. there are 800 tuna up for auction -- almost twice as many as usual. they've been caught in the atlantic, the mediterranean or in the pacific ocean off the coast of japan. kurihara wants to take part in the bidding. he already has potential customers for two or three fish, if he can get them for the right price. >> these cost up to 6-thousand yen per kilo -- the big ones back there will fetch up to 12- thousand yen for sure. >> that means a 150-kilo fish can cost up to 18-thousand euros. but that's even a bargain. blue-fin tuna prices in japan have doubled in recent years. demand is surging, but the fish population isn't. the worldwide fund for nature says the species could be wiped out in the mediterranean by next year. but the japanese government has blocked moves to impose tougher catch quotas. >> previously, the tuna problem happene